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    <title>《数字媒体技术》课程作业</title>
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     <header> </header>
    <nav>
        <h1>第一次作业</h1>
        <ul>
         <li><a href="01/index.html">返回首页</a></li>
         </ul>
     </nav>
     <article>
        <header>
         <h2>《美丽一次》</h2>
         <p>发表时间 评论数</p>
        </header>
        <p>内容段落</p>
       </article>
       <h1>To Do</h1>
<ul>
 <li>Empty the dishwasher</li>
 <li><ins datetime="2009-10-11T01:25-07:00">Watch Walter Lewin's lectures</ins></li>
 <li><del datetime="2009-10-10T23:38-07:00">Download more tracks</del></li>
 <li>Buy a printer</li>
</ul>
       <dl>
        <dt> 作者 </dt>
        <dd> Adam </dd>
        <dd> Cui </dd>
        <dt> 编辑 </dt>
        <dd> Fang </dd>
       </dl>
       <table>
        <caption>表格说明文字</caption>
      <thead>
       <tr> <th> ID <th> Measurement <th> Average <th> Maximum
      </thead>
      <tbody>
       <tr> <td> <th scope=rowgroup> Cats <td> <td>
       <tr> <td> 93 <th scope=row> Legs <td> 3.5 <td> 4
       <tr> <td> 10 <th scope=row> Tails <td> 1 <td> 1
      </tbody>
      <tbody>
       <tr> <td> <th scope=rowgroup> English speakers <td> <td>
       <tr> <td> 32 <th scope=row> Legs <td> 2.67 <td> 4
       <tr> <td> 35 <th scope=row> Tails <td> 0.33 <td> 1
      </tbody>
     </table>

     <picture>
        <img srcset="../images/img-罗小黑桌面.jpg" alt="My default image">
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     <video src="back.ogv" controls poster="screenshot.jpg"></video> 